
Keelhaul
Historical Brutality
 Originally a brutal punishment at sea, imparting danger and harshness. 
Tales of pirates often mention the cruel method of keelhauling.
 Literal Interpretation
 Literally dragging under a ship's keel; involves the concept of maritime. 
In the navy, you'd fear being keelhauled for serious offenses.
 Extreme Consequence
 Indicates a punishment beyond the norm, very severe and rare. 
To deter mutiny, the captain threatened to keelhaul the first to disobey.